Hyper-V Best Practices by Benedict Berger

Author:Benedict Berger
Language: eng
Format: mobi, pdf
Publisher: Packt Publishing
Published: 2014-11-28T08:00:00+00:00

For optimal performance on CSVs, make sure that you defrag your virtual hard disks before moving them to a CSV by adding disk images to a VM, creating checkpoints and also the VM memory itself uses space on your CSVs. When a VM is powered on, it creates a file of size equal to the RAM in the VM folder on the CSV when the automatic stop action of the VM is on "save". Plan to fill up your CSVs with a maximum of 75 percent of its capacity to allow growth of all these files. If you want to know how much free space is available on your CSVs considering all dependencies, there is a great PowerShell script available on this page at http://bit.ly/1mloKQC.

Cluster Shared Volumes can be encrypted with Bitlocker; they will receive a performance hit around 20-30 percent. Encrypting your CSVs with Bitlocker not only increases the physical security of the data, it is also a great way to reduce the risk of data loss in a case of a hard disk change for whatever reason.

CSVs comes with special configuration considerations. Make sure the network adapters used for CSVs have the client for Microsoft networks and file and printer sharing for Microsoft networks is enabled. In most cases, it's suggested that you activate Microsoft Failover Cluster Virtual Adapter Performance Filter too. However, if you are using Guest Cluster in your virtual machine, this setting should be disabled on the host level to avoid problems with backups and cluster options.

Enabling the CSV cache provides caching at the block level for read-only, unbuffered I/O operations by allocating system memory (RAM) as cache. 80 percent of the physical RAM can be used as a CSV cache. It's best practice to use the CSV cache on Hyper-V Clusters. I've seen best performance/price ratios around 512-1024 MB; however, it should not be larger than 2 GB. Use the following command to configure the CSV cache in an elevated prompt to set the cache to 512 MB of data and use this value as a default for your CSV files:

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